Fluid-feed side-inlet drill-bit.



No. 887,051. PATENTED MAY 5, 1908. J-. H. WIEST.

FLUID FEED SIDE INLET DRILL BIT APPLICATION FILED JUNE 24, 1907.

WITNESSES. IIVVENTOR FLUID-FEED SIDE-INLET DRILL-Bil.

Specification 01 Letters Patent.

Patented May 5, 1908.

Application filed June 24; 1907. Serial No. 380,613.

To all whom it may concern: Be it known that I, Jonx HENRY IEsT,residing at Boulder, m the'county ot Boulder and State of. Colorado,have invented a new that type of hollow rock cutting drill. bits havingside inlets, more especially seeks to provide certain improvements inthe form of a drill bit and fluid feed coupling devices dis closed, inmy Patent No. 845,385, patented February 27, 1907.

\Yhile I have found the construction and arrangement of parts disclosedin the patent aforesaid as generally effective and presenting theadvantages set out, yet frompractical experiment I have alsov found.that the side inlot weakens the bit stock, and undersome conditionscauses it to easily break at that point.

.l urthermore, by reason ofthe drill bithaving a uniform smooth externalface, great strain of the clamping member on the drill .at the sideinlet is necessary to hold the fluid feed.

pipe in 'prbper register with the said side inet, a nozzle connectionbeing also necessary to insure a proper flow of the fluid into the sideinlet and also for holding the clamping device from creeping laterallyon the drill stock.

My present invention especially seeks to provide certain improvements onthe patcnted invention stated, whereby toovercome the objections noted,whereby the clamping device can be readily applied to the drill bit, andthe coupling of the fluid conveyance ipe therewith made without the useof a nipp e or nozzle end and further whereby the drill bitissufliciently reinforced at the side opening end to overcome anyweakening of the bit at that point. With the above objects in view, myinvention comprehends certain details of construction and eculiarcombination of arts, all of which be hereinafter fully explained,specifica'lly pointed out in the appended claims, and illustratedin theaccompanying drawings, in which:

Figure 1, is a side inlet drill bit with my improvements applied- Fig.2, is a similar view of the upper end of the drill bit, showingcharacter of drill construction used. Fig. 3, is a transverse section ofthe part shown in Fig. 1, taken centrally through the pipe 1 and theaperture 20-. Fig. 4,.isa longitudinal section taken on the l-inel4 ofFig 3. Fig. 5; is; a perspective view of the coupling with the fluidfeed pi eattached. Fig. 6, is a perspective view 0 the coupling device,opened. In my present invention, the 'drill'bit 2, whichisof that typewhose central bore or fluid channel is stopped at the inner orstrikingend and connects=with a side inlet 20, as clearly shown in Fig. i -thecutting or drilling end also being of the conventional shape, as shown.v I y In my present invention, the .side'inlet is not threaded and is ofuniform diameter its length. At the oint where it has the side inlet 20,the drili st-ock'is reinforced by enlarging it"annularly as at 21.- Attheinlet ,side and at that side diametrically opposite the inlet side,the reinforced portion isrecessedor reduced to a-diameter-e ual that ofthe, main portion of the drill stoc whereby topresent two 0 posingparallel bearing sur faces 22 andeac 1 located between a pair of.

the similar device shown in the patent before referred to, the member 3having the threaded opening 30 to receive the externally threadedportion of the feed pipe 1 whose end is straight whereby to flatwiseengage the drill stock and close over the feed inlet thereof as clearlyshown on Fig. 3.

The coupling member 3 has the coupling lever 5, fulcrumed between itsbifurcated ends 31 and pivotally joins with the L- shaped couplingmember 6, that pivotally connects wlth the locking yoke 8, whose crossbar 81 cooperates with the curved edges 33 of the member 3 and thelocking lever 5, the several coupling device members referred tobeingarranged to cooperate the same asin the patent beforementioned, and inthe manner clearly understood from the drawing.

In order to insure a ti ht joint between the in 'the manner shown andgasket will be tightly held against the drill bit and insure an airtight joint being made between the pi e 1 and the bit.

'By reason constructin the drill stock escribed, it will be readilyapparent that when the coupling device-is adjusted as in Fig. 3, the endof the feed pipe 1 will be positively held up against the feed inlet 20and from movin laterally .on the drill by reason of the coup ing members3 arid 6 being located between the opposing shoulders 23 on the drill,and by providing thedrill stock with additional metal at the couplingpoint, the said drill stock is materially strengthened and danger ofbreak-f sides of the drill; of a feed pipe, a yoke frame that carriessaid pipe, and mean'sfor clamping the oke frame on the op osing fiatsides of the'd i'ill and for holdin tliie discharge of the feed pi e aainst the i bit, as set ort 2. The combination with the hollow sideforth.

et end of the drill feed inlet drill bit, said bit having an enlarged orreinforced portion at the inlet formed with opposingflat seats andshoulders at the ends of the seats; of a-feed pipe, a yoke frame that suports thedischarge end of said pipe, said yo e frame includin op os mgmembers adapted to engage the at S1Cl6S of the drill and seat betweenthe shoulders thereof, and means 006 crating. with the yoke for clampingsaid yo 3. A hollow drill having a side feed inlet, said drill havingthe inlet portion annularly e in the drill as set enlarged, and formedwith 0 posing flat faces, and shoulders at the en s of the flat faces,the inlet opening in one of the flat faces for the purposes specified.

4. The combination with a hollow drill bit having a side feed inlet andreinforced portions at the side feed inlet port thereof; of a feed pipea'clamping means that cooperates with the feed pipe for englaging thereinforced part ofthe drill bitand o ding .the feed pipe closely overthe side feed inlet and in cont-act vwith the, drill stock, said claming means having a groove and a gasket eld'in said groove around thesaid feed i-pe for engagin the drill stock, substantialFy as shown andescribed.

JOHN HENRY WIEST.

Witnesses: t

T. S. WALTEMEYER, RUTH E. SHELDON.

